WITH THE AVERAGE price of used cars around $28,000 and interest on auto loans above 11 percent, many people are looking for good deals. One option: Buy from a rental company. Because these companies purchase cars at bulk rates, they can sell them “at a bit of a discount,” says Matt Smith, deputy editor for CarGurus. But what about wear and tear? Joseph Yoon, an analyst for Edmunds, says not to worry; rental cars are well maintained and typically two to three years old.